Basis is a way of measuring your investment in property for tax purposes. You must know the basis of your property to determine whether you have a gain or loss on its sale or other disposition.

Investment property you buy normally has an original basis equal to its cost. If you get property in some way other than buying it, such as by gift or inheritance, its fair market value may be important in figuring the basis.

If you buy property on a time-payment plan that charges little or no interest, the basis of your property is your stated purchase price, minus the amount considered to be unstated interest. You generally have unstated interest if your interest rate is less than the applicable federal rate. For more information, see Unstated Interest andOriginal Issue Discount (OID) in Publication 537.

This is the price at which the property would change hands between a buyer and a seller, neither being forced to buy or sell and both having reasonable knowledge of all the relevant facts. Sales of similar property, around the same date, may be helpful in figuring fair market value.

If you receive investment property for services, you must include the property's fair market value in income. The amount you include in income then becomes your basis in the property. If the services were performed for a price that was agreed to beforehand, this price will be accepted as the fair market value of the property if there is no evidence to the contrary.

If you receive, as payment for services, property that is subject to certain restrictions, your basis in the property generally is its fair market value when it becomes substantially vested. Property becomes substantially vested when it is transferable or is no longer subject to substantial risk of forfeiture, whichever happens first. See Restricted Property in Publication 525 for more information.

If you buy investment property at less than fair market value, as payment for services, you must include the difference in income. Your basis in the property is the price you pay plus the amount you include in income.

You trade A Company stock for B Company stock having a fair market value of $1,200. If the adjusted basis of the A Company stock is less than $1,200, you have a taxable gain on the trade. If the adjusted basis of the A Company stock is more than $1,200, you have a deductible loss on the trade. The basis of your B Company stock is $1,200. If you later sell the B Company stock for $1,300, you will have a gain of $100.

If you have a nontaxable trade, you do not recognize gain or loss until you dispose of the property you received in the trade. See Nontaxable Trades, later.

The basis of property you received in a nontaxable or partly nontaxable trade is generally the same as the adjusted basis of the property you gave up. Increase this amount by any cash you paid, additional costs you had, and any gain recognized. Reduce this amount by any cash or unlike property you received, any loss recognized, and any liability of yours that was assumed or treated as assumed.

If property is transferred to you from your spouse (or former spouse, if the transfer is incident to your divorce), your basis is the same as your spouse's or former spouse's adjusted basis just before the transfer. See Transfers Between Spouses, later.

Recordkeeping. The transferor must give you the records necessary to determine the adjusted basis and holding period of the property as of the date of the transfer.

To figure your basis in property that you received as a gift, you must know its adjusted basis to the donor just before it was given to you, its fair market value at the time it was given to you, the amount of any gift tax paid on it, and the date it was given to you.

If the fair market value of the property at the time of the gift was less than the donor's adjusted basis just before the gift, your basis for gain on its sale or other disposition is the same as the donor's adjusted basis plus or minus any required adjustments to basis during the period you hold the property. Your basis for loss is its fair market value at the time of the gift plus or minus any required adjustments to basis during the period you hold the property.

You receive a gift of investment property having an adjusted basis of $10,000 at the time of the gift. The fair market value at the time of the gift is $9,000. You later sell the property for $9,500. You have neither gain nor loss. Your basis for figuring gain is $10,000, and $9,500 minus $10,000 results in a $500 loss. Your basis for figuring loss is $9,000, and $9,500 minus $9,000 results in a $500 gain.

If the fair market value of the property at the time of the gift was equal to or more than the donor's adjusted basis just before the gift, your basis for gain or loss on its sale or other disposition is the donor's adjusted basis plus or minus any required adjustments to basis during the period you hold the property. Also, you may be allowed to add to the donor's adjusted basis all or part of any gift tax paid, depending on the date of the gift.

If you received property as a gift before 1977, your basis in the property is the donor's adjusted basis increased by the total gift tax paid on the gift. However, your basis cannot be more than the fair market value of the gift at the time it was given to you.

You were given XYZ Company stock in 1976. At the time of the gift, the stock had a fair market value of $21,000. The donor's adjusted basis was $20,000. The donor paid a gift tax of $500 on the gift. Your basis for gain or loss is $20,500, the donor's adjusted basis plus the amount of gift tax paid.

The facts are the same as in Example 1 except that the gift tax paid was $1,500. Your basis is $21,000, the donor's adjusted basis plus the gift tax paid, but limited to the fair market value of the stock at the time of the gift.

If you received property as a gift after 1976, your basis is the donor's adjusted basis increased by the part of the gift tax paid that was for the net increase in value of the gift. You figure this part by multiplying the gift tax paid on the gift by a fraction. The numerator (top part) is the net increase in value of the gift and the denominator (bottom part) is the amount of the gift.

The net increase in value of the gift is the fair market value of the gift minus the donor's adjusted basis. The amount of the gift is its value for gift tax purposes after reduction by any annual exclusion and marital or charitable deduction that applies to the gift.

In 2008, you received a gift of property from your mother. At the time of the gift, the property had a fair market value of $101,000 and an adjusted basis to her of $40,000. The amount of the gift for gift tax purposes was $89,000 ($101,000 minus the $12,000 annual exclusion), and your mother paid a gift tax of $21,000. You figure your basis in the following way:

If you get property in a transfer that is partly a sale and partly a gift, your basis is the larger of the amount you paid for the property or the transferor's adjusted basis in the property at the time of the transfer. Add to that amount the amount of any gift tax paid on the gift, as described in the preceding discussion. For figuring loss, your basis is limited to the property's fair market value at the time of the transfer.

If you inherited property, your basis in that property generally is its fair market value (its appraised value on Form 706, United States Estate (and Generation-Skipping Transfer) Tax Return) on:

The date of the decedent's death, or

The later alternate valuation date if the estate qualifies for, and elects to use, alternate valuation.

If no Form 706 was filed, use the appraised value on the date of death for state inheritance or transmission taxes. For stocks and bonds, if no Form 706 was filed and there are no state inheritance or transmission taxes, see the Form 706 instructions for figuring the fair market value of the stocks and bonds on the date of the decedent's death.

Your basis in certain appreciated property that you inherited is the decedent's adjusted basis in the property immediately before death rather than its fair market value. This applies to appreciated property that you or your spouse gave the decedent as a gift during the 1-year period ending on the date of death. Appreciated property is any property whose fair market value on the day you gave it to the decedent was more than its adjusted basis.

See Publication 551, Basis of Assets, for more information on the basis of inherited property, including community property, property held by a surviving tenant in a joint tenancy or tenancy by the entirety, a qualified joint interest, and a farm or closely held business.

Before you can figure any gain or loss on a sale, exchange, or other disposition of property or figure allowable depreciation, depletion, or amortization, you usually must make certain adjustments (increases and decreases) to the basis of the property. The result of these adjustments to the basis is the adjusted basis.

Adjustments to the basis of stocks and bonds are explained in the following discussion. For information about other adjustments to basis, see Publication 551.

The basis of stocks or bonds you own generally is the purchase price plus the costs of purchase, such as commissions and recording or transfer fees. If you acquired stock or bonds other than by purchase, your basis is usually determined by fair market value or the previous owner's adjusted basis as discussed earlier under Basis Other Than Cost.

The basis of stock must be adjusted for certain events that occur after purchase. For example, if you receive more stock from nontaxable stock dividends or stock splits, you must reduce the basis of your original stock. You must also reduce your basis when you receive nondividend distributions (discussed in chapter 1). These distributions, up to the amount of your basis, are a nontaxable return of capital.

The IRS partners with companies that offer Schedule D software that can import trades from many brokerage firms and accounting software to help you keep track of your adjusted basis in securities. To find out more, go to http://www.irs.gov/efile.

You will make an adequate identification if you show that certificates representing shares of stock from a lot that you bought on a certain date or for a certain price were delivered to your broker or other agent.

If you bought stock in different lots at different times and you hold a single stock certificate for this stock, you will make an adequate identification if you:

Tell your broker or other agent the particular stock to be sold or transferred when you deliver the certificate to your broker or other agent, and

Receive a written confirmation of this from your broker or other agent within a reasonable time.

If you sell part of the stock represented by a single certificate directly to the buyer instead of through a broker, you will make an adequate identification if you keep a written record of the particular stock that you intend to sell.

If you buy and sell securities at various times in varying quantities and you cannot adequately identify the shares you sell, the basis of the securities you sell is the basis of the securities you acquired first. Except for certain mutual fund shares, discussed later, you cannot use the average price per share to figure gain or loss on the sale of the shares.

You bought 100 shares of stock of XYZ Corporation in 1995 for $10 a share. In January 1996 you bought another 200 shares for $11 a share. In July 1996 you gave your son 50 shares. In December 1998 you bought 100 shares for $9 a share. In April 2008 you sold 130 shares. You cannot identify the shares you disposed of, so you must use the stock you acquired first to figure the basis. The shares of stock you gave your son had a basis of $500 (50 × $10). You figure the basis of the 130 shares of stock you sold in 2008 as follows:

Your cost basis in a mutual fund often includes a sales fee, also known as a load charge. But, in certain cases, you cannot include the entire amount of a load charge in your basis if the charge gives you a reinvestment right. For more information, see Publication 564.

You can choose to use the average basis of mutual fund shares if you acquired the shares at various times and prices and left them on deposit in an account kept by a custodian or agent. The methods you can use to figure average basis are explained in Publication 564.

If you had to include in your income any undistributed capital gains of the mutual fund or REIT, increase your basis in the stock by the difference between the amount you included and the amount of tax paid for you by the fund or REIT. See Undistributed capital gains of mutual funds and REITs under Capital Gain Distributions in chapter 1.

If you participate in an automatic investment service, your basis for each share of stock, including fractional shares, bought by the bank or other agent is the purchase price plus a share of the broker's commission.

If you participate in a dividend reinvestment plan and receive stock from the corporation at a discount, your basis is the full fair market value of the stock on the dividend payment date. You must include the amount of the discount in your income.

Stock dividends are distributions made by a corporation of its own stock. Generally, stock dividends are not taxable to you. However, see Distributions of Stock and Stock Rights under Dividends and Other Corporate Distributions in chapter 1 for some exceptions. If the stock dividends are not taxable, you must divide your basis for the old stock between the old and new stock.

If the new stock you received as a nontaxable dividend is identical to the old stock on which the dividend was declared, divide the adjusted basis of the old stock by the number of shares of old and new stock. The result is your basis for each share of stock.

You owned one share of common stock that you bought for $45. The corporation distributed two new shares of common stock for each share held. You then had three shares of common stock. Your basis in each share is $15 ($45 ÷ 3).

You owned two shares of common stock. You had bought one for $30 and the other for $45. The corporation distributed two new shares of common stock for each share held. You had six shares after the distribution—three with a basis of $10 each ($30 ÷ 3) and three with a basis of $15 each ($45 ÷ 3).

If the new stock you received as a nontaxable dividend is not identical to the old stock on which it was declared, the basis of the new stock is calculated differently. Divide the adjusted basis of the old stock between the old and the new stock in the ratio of the fair market value of each lot of stock to the total fair market value of both lots on the date of distribution of the new stock.

You bought a share of common stock for $100. Later, the corporation distributed a share of preferred stock for each share of common stock held. At the date of distribution, your common stock had a fair market value of $150 and the preferred stock had a fair market value of $50. You figure the basis of the old and new stock by dividing your $100 basis between them. The basis of your common stock is $75 ($150/$200 × $100), and the basis of the new preferred stock is $25 ($50/$200 × $100).

A stock right is a right to acquire a corporation's stock. It may be exercised, it may be sold if it has a market value, or it may expire. Stock rights are rarely taxable when you receive them. See Distributions of Stock and Stock Rights under Dividends and Other Corporate Distributions in chapter 1.

If you receive nontaxable stock rights and allow them to expire, they have no basis.

If you exercise or sell the nontaxable stock rights and if, at the time of distribution, the stock rights had a fair market value of 15% or more of the fair market value of the old stock, you must divide the adjusted basis of the old stock between the old stock and the stock rights. Use a ratio of the fair market value of each to the total fair market value of both at the time of distribution.

If the fair market value of the stock rights was less than 15%, their basis is zero. However, you can choose to divide the basis of the old stock between the old stock and the stock rights. To make the choice, attach a statement to your return for the year in which you received the rights, stating that you choose to divide the basis of the stock.

You own 100 shares of ABC Company stock, which cost you $22 per share. The ABC Company gave you 10 nontaxable stock rights that would allow you to buy 10 more shares at $26 per share. At the time the stock rights were distributed, the stock had a market value of $30, not including the stock rights. Each stock right had a market value of $3. The market value of the stock rights was less than 15% of the market value of the stock, but you chose to divide the basis of your stock between the stock and the rights. You figure the basis of the rights and the basis of the old stock as follows:

100 shares × $22 = $2,200, basis of old stock

100 shares × $30 = $3,000, market value of old stock

10 rights × $3 = $30, market value of rights

($3,000 ÷ $3,030) × $2,200 = $2,178.22, new basis of old stock

($30 ÷ $3,030) × $2,200 = $21.78, basis of rights

If you sell the rights, the basis for figuring gain or loss is $2.18 ($21.78 ÷ 10) per right. If you exercise the rights, the basis of the stock you acquire is the price you pay ($26) plus the basis of the right exercised ($2.18), or $28.18 per share. The remaining basis of the old stock is $21.78 per share.

In general, if you receive investment property as a distribution in partial or complete liquidation of a corporation and if you recognize gain or loss when you acquire the property, your basis in the property is its fair market value at the time of the distribution.

Specialized small business investment company stock or partnership interest.(p44)

If you bought this stock or interest as replacement property for publicly traded securities you sold at a gain, you must reduce the basis of the stock or interest by the amount of any postponed gain on that sale. See Rollover of Gain From Publicly Traded Securities, later.

If you bought this stock as replacement property for other qualified small business stock you sold at a gain, you must reduce the basis of this replacement stock by the amount of any postponed gain on the earlier sale. See Gains on Qualified Small Business Stock, later.

If you cannot deduct payments you make to a lender in lieu of dividends on stock used in a short sale, the amount you pay to the lender is a capital expense, and you must add it to the basis of the stock used to close the short sale.

If you buy a bond at a premium, the premium is treated as part of your basis in the bond. If you choose to amortize the premium paid on a taxable bond, you must reduce the basis of the bond by the amortized part of the premium each year over the life of the bond.

Although you cannot deduct the premium on a tax-exempt bond, you must amortize it to determine your adjusted basis in the bond. You must reduce the basis of the bond by the premium you amortized for the period you held the bond.

If you include market discount on a bond in income currently, increase the basis of your bond by the amount of market discount you include in your income. See Market Discount Bonds in chapter 1 for more information.

A bond purchased at par value (face amount) has no premium or discount. When you sell or otherwise dispose of the bond, you figure the gain or loss by comparing the bond proceeds to the purchase price of the bond.

You purchased a bond several years ago for its par value of $10,000. You sold the bond this year for $10,100. You have a gain of $100. However, if you had sold the bond for $9,900, you would have a loss of $100.

If you include acquisition discount on a short-term obligation in your income currently, increase the basis of the obligation by the amount of acquisition discount you include in your income. See Discount on Short-Term Obligations in chapter 1 for more information.

OID on tax-exempt obligations is generally not taxable. However, when you dispose of a tax-exempt obligation issued after September 3, 1982, that you acquired after March 1, 1984, you must accrue OID on the obligation to determine its adjusted basis. The accrued OID is added to the basis of the obligation to determine your gain or loss.

For information on determining OID on a long-term obligation, see Debt Instruments Issued After July 1, 1982, and Before 1985 or Debt Instruments Issued After 1984, whichever applies, in Publication 1212 under Figuring OID on Long-Term Debt Instruments.

If the tax-exempt obligation has a maturity of 1 year or less, accrue OID under the rules for acquisition discount on short-term obligations. See Discount on Short-Term Obligations in chapter 1.

If you acquired a stripped tax-exempt bond or coupon after October 22, 1986, you must accrue OID on it to determine its adjusted basis when you dispose of it. For stripped tax-exempt bonds or coupons acquired after June 10, 1987, part of this OID may be taxable. You accrue the OID on these obligations in the manner described in chapter 1 under Stripped Bonds and Coupons.

Increase your basis in the stripped tax-exempt bond or coupon by the taxable and nontaxable accrued OID. Also increase your basis by the interest that accrued (but was not paid, and was not previously reflected in your basis) before the date you sold the bond or coupon. In addition, for bonds acquired after June 10, 1987, add to your basis any accrued market discount not previously reflected in basis.